"You're the Best Lee Soon Shin" Ko Joo Won and Yoo In Na begin a relationship under a contract.

April 28, the 16th episode of the KBS weekend drama "You're the Best Lee Soon Shin" featured Park Chan Woo (Ko Joo Won) and Lee Yoo Shin (Yoo In Na) creating a contract for their relationship.

Lee Yoo Shin finally decides to be honest with her feelings toward Park Chan Woo. She tells him, "Before we make it official, there are some rules that we should agree on" and begins to create a contract.

The contract read, "First, as soon as our family finds out, this relationship ends. Second, we must respect each other's work. You must not visit at work unannounced. Third, we must not be possessive."

Park Chan Woo agreed on the rules on the contract but added, "During the time we are dating, we must be faithful to each other, don't speak to each other roughly and don't hit each other."

Park Chan Woo signs the contract without hesitation. It is the beginning of Park Chan Woo and Lee Yoo Shin's official relationship. Will they be able to keep all their promises on the contract?